Kate Middleton, Princess Charlotte and Prince Louis reportedly attended a Christmas variety show a few days before the royal family stepped out at Sandringham on Dec. 25.

Kate Middleton and Princess Charlotte shared a heartwarming piano duet at the "Together at Christmas" carol service, playing "Holm Sound."

Kate Middleton is an international fashion icon known for her classic, conservative style. Her fashion has influenced trends globally for over a decade. That’s why royal watchers weren’t shocked when Princess Charlotte appeared to mirror her mother’s look.

Prince George, Princess Charlotte and Prince Louis are continuing to support a cause their mother, Kate Middleton, first introduced them to. On Dec. 28, The Baby Bank revealed that Prince George, 12, Princess Charlotte, 10, and Prince Louis, 7, donated "essential practical everyday items" selected by the siblings for the charity this year.

Princess Diana owned a wardrobe fit for royalty. Kate Middleton inherited much of her collection, but she might have missed out on this one signature accessory.

When Kate Middleton and daughter Princess Charlotte sat down behind the piano at Windsor Castle to perform a duet of Erland Cooper’s piece “Holm Sound,” they were prepared and “needed no direction,” Cooper said.

The Princess of Wales and Princess Charlotte shared a surprise (and poignant) moment at the royal Christmas carol service.